in the context of a shopping cart application. I've seen applications on
other sites where you get a message to the effect of "Your session has
expired" rather than just a "Your shopping cart is empty". I'm trying to
figure out how to do this.
I can check to see if certain session variables exist, but can't think of a
way to tell whether they were never set or if they existed at one time and
have now "gone away" due to the session expiring.
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